#include<iostream>
#include<fstream>
#include<iomanip>
#include<string>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char x[250];
int p, cuv;
int main()
{
	fin.get(x, 250);
	for(int i = 0; x[i]; i++)
		if(isalpha(x[i]))p++;
	/*for(int i = 1; x[i]; i++)
		if(isalpha(x[i]));
		else
			if(isalpha(x[i-1]) && !isalpha(x[i]))
				cuv+=1;
	*/
	for(int i = 0; x[i]; i++)
	{
		while(isalpha(x[i]))i++;
		if(x[i]==' '|| (x[i]=='-'&& isalpha(x[i-1]))) cuv++;
	}
	fout<<p/cuv;
	fin.close();
	fout.close();
	return 0;
}